66851374 has 4 divisors (see below), whose sum is σ = 100277064. Its totient is φ = 33425686.

The previous prime is 66851311. The next prime is 66851377. The reversal of 66851374 is 47315866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66851377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16712842 + ... + 16712845.

It is an arithmetic number, because the mean of its divisors is an integer number (25069266).

Almost surely, 2^66851374 is an apocalyptic number.

66851374 is a deficient number, since it is larger than the sum of its proper divisors (33425690).

66851374 is a wasteful number, since it uses less digits than its factorization.

66851374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33425689.

The product of its digits is 120960, while the sum is 40.

The square root of 66851374 is about 8176.2689535020. The cubic root of 66851374 is about 405.8542634979.

The spelling of 66851374 in words is "sixty-six million, eight hundred fifty-one thousand, three hundred seventy-four".